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NMR study of the relaxation mechanisms in single crystals of the nonlinear optical material bismuth triborate
Author(s) -
Lim Ae Ran,
Jang Jong Hoon,
Yoon In Ho,
Yoon Choon Sup
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201046083
Subject(s) - quadrupole , relaxation (psychology) , raman spectroscopy , electric field , bismuth , electric field gradient , spin–lattice relaxation , chemistry , condensed matter physics , phonon , nuclear magnetic resonance , materials science , nuclear quadrupole resonance , optics , atomic physics , physics , psychology , social psychology , quantum mechanics , organic chemistry
The 11 B NMR spectrum and relaxation processes in BiB 3 O 6 crystals were investigated by determining the spin–lattice relaxation rates, 1/ T 1 , of 11 B NMR. The 11 B spectrum obtained at room temperature indicates the presence of two types of chemically inequivalent 11 B nuclei, designated B(1) and B(2). The relaxation rates of the 11 B nuclei in the crystals were found to increase with increasing temperature, and could be described by the relation 1/ T 1 ∝ α + βT 2 . The dominant relaxation mechanism for nuclei possessing electric quadrupole moments is provided by the coupling of these moments to the thermal fluctuations of the local electric field gradients via Raman spin–phonon process.